Abstract
A study of the thermodynamics of ion exchange equilibrium for uni-univalent Clâ/Iâ, Clâ/Brâ and uni-divalent Clâ/SO 4 2â , Clâ/C2O 4 2â reaction systems was carried out using ion exchange resin Indion-830 (Type 1). The equilibrium constant K was calculated by taking into account the activity coefficients of ions both in solution and in the resin phase. For uni-univalent ion exchange reaction systems, the equilibrium constants KⲠwere also calculated from the mole fraction of ions in the resin phase. The K values calculated for uni-univalent and uni-divalent anion exchange reaction systems increased as the temperature grew, indicating the endothermic character of the exchange reactions with enthalpies of 38.2, 32.3, 7.6, and 11.4 kJ/mol, respectively.
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